Electrical Engineering Guides

Gas Insulated Switchgear(GIS)

China's first ±550 kV DC GIS completes long-term energized test.

Recently, a ±550 kV DC GIS (Gas-Insulated Switchgear), jointly developed by a Chinese GIS manufacturer and multiple companies, successfully completed a 180-day outdoor long-term energized reliability test at the Xi’an High Voltage Apparatus Research Institute. This marks the first time in the indust

By Baker 11/25, 2025
Gas Insulated Switchgear(GIS)

First Fully Unmanned GIS Inspection at ±800kV UHV Station

On October 16, a ±800 kV ultra-high-voltage (UHV) transmission project completed all its maintenance tasks and was fully re-energized. During this period, a regional power company successfully conducted the first-ever fully unmanned inspection of the GIS (Gas-Insulated Switchgear) room at a UHV conv

By Baker 11/21, 2025
Gas Insulated Switchgear(GIS)

China's first 252 kV mixed-gas double-break GIS product successfully passes on-site power frequency withstand voltage test.

Recently, Chinese GIS manufacturers announced exciting news: the first ZF11C-252(L) mixed-gas double-break GIS product developed by a Chinese GIS manufacturer successfully passed its on-site power frequency withstand voltage test on the first attempt at a project site. This achievement marks another

By Baker 11/18, 2025
Gas Insulated Switchgear(GIS)

Testing Methods for Newly Installed 35 kV GIS Gas-Insulated Switchgear

GIS (Gas-Insulated Switchgear) offers advantages such as compact structure, flexible operation, reliable interlocking, long service life, maintenance-free operation, and small footprint. It also possesses many irreplaceable advantages in insulation performance, environmental friendliness, and energy

By Oliver Watts 11/18, 2025
Gas Insulated Switchgear(GIS)

Analysis and Handling of a Breakdown Discharge Fault in a 550 kV GIS Disconnector

1.Description of the Fault Phenomenon The disconnector fault in a 550 kV GIS equipment occurred at 13:25 on August 15, 2024, while the equipment was operating under full load with a load current of 2500 A. At the moment of failure, the associated protection devices acted promptly, tripping the corre

By Felix Spark 11/17, 2025
Switch Disconnectors

Impact Analysis of GIS Disconnector Operations on Secondary Equipment

Impact of GIS Disconnector Operations on Secondary Equipment and Mitigation Measures 1.Impacts of GIS Disconnector Operations on Secondary Equipment 1.1 Transient Overvoltage Effects During opening/closing operations of Gas-Insulated Switchgear (GIS) disconnectors, repeated arc reignition and extinc

By Echo 11/15, 2025
Gas Insulated Switchgear(GIS)

Hitachi Energy to deliver the world’s first 550kV SF6-free eco-efficient GIS.

Hitachi Energy recently announced it will supply State Grid Corporation of China’s Central China Branch with the world’s first 550 kV SF₆-free GIS. This groundbreaking innovation marks a significant milestone in grid decarbonization and contributes to China’s commitment to achieving carbon neutralit

By Baker 11/13, 2025
Gas Insulated Switchgear(GIS)

The world's first 800 kV / 80 kA circuit breaker has passed national-level technical appraisal.

On November 9, a new type of circuit breaker for gas-insulated metal-enclosed switchgear—designated ZF27-800(L)/Y6300-80—successfully passed a national-level technical appraisal organized by the Chinese Society for Electrical Engineering (CSEE) in Beijing. Developed jointly by a leading Chinese manu

By Baker 11/13, 2025
Gas Insulated Switchgear (GIS)

North American Standards: A Comparison Between IEEE and Chinese Switchgear Standards

IEEE Std C37.20.9™ defines the design, testing, and installation requirements for metal-enclosed gas-insulated switchgear (MEGIS) using gas at pressures above ambient as the primary insulation medium for alternating current systems rated from 1 kV to 52 kV. This includes, but is not limited to, circ

By James 11/10, 2025
Gas Insulated Switchgear(GIS)

SF6 Leak Detection Methods for GIS Equipment

For SF6 gas leakage rate detection in GIS equipment, when using the quantitative leak detection method, the initial SF6 gas content in the GIS equipment must be accurately measured. According to relevant standards, the measurement error should be controlled within ±0.5%. The leakage rate is calculat

By Oliver Watts 10/31, 2025
GIS Installation

Top 5 Critical Process Controls for GIS Installation & Commissioning

This paper briefly outlines the advantages and technical characteristics of GIS (Gas-Insulated Switchgear) equipment, and elaborates on several critical quality control points and process control measures during on-site installation. It emphasizes that on-site withstand voltage tests can only partia

By James 10/29, 2025
Power Systems

GIS Bolt Tightening Torque Standards by Material & Size

GIS (Gas-Insulated Metal-Enclosed Switchgear) contains numerous bolted and screwed connections, and the tightening torque varies depending on bolt material, size, and application. The recommended tightening torque values are listed below for reference: Table 1 Tightening Torque Values for Bolts of D

By Encyclopedia 10/24, 2025

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China's first ±550 kV DC GIS completes long-term energized test.

First Fully Unmanned GIS Inspection at ±800kV UHV Station

China's first 252 kV mixed-gas double-break GIS product successfully passes on-site power frequency withstand voltage test.

Testing Methods for Newly Installed 35 kV GIS Gas-Insulated Switchgear

Analysis and Handling of a Breakdown Discharge Fault in a 550 kV GIS Disconnector

Impact Analysis of GIS Disconnector Operations on Secondary Equipment

Hitachi Energy to deliver the world’s first 550kV SF6-free eco-efficient GIS.

The world's first 800 kV / 80 kA circuit breaker has passed national-level technical appraisal.

North American Standards: A Comparison Between IEEE and Chinese Switchgear Standards

SF6 Leak Detection Methods for GIS Equipment

Top 5 Critical Process Controls for GIS Installation & Commissioning

GIS Bolt Tightening Torque Standards by Material & Size

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